Flying Saucer Daffy (1958)

Joe accidentally takes a picture of a paper plate which Moe and Larry submit to a magazine as an authentic picture of a flying saucer. Moe and Larry collect a big prize, but when the picture is proven to be phony, they're hauled off to Jail. Joe then gets a picture of a real spaceship and this time he gets the fame and fortune, while Moe and Larry wind up in a sanitarium.